CN112375974A - Deformed steel bar produced by high-chromium molten iron and preparation method thereof - Google Patents
Deformed steel bar produced by high-chromium molten iron and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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Abstract
The invention discloses deformed steel bar produced by high chromium molten iron and a preparation method thereof, wherein the deformed steel bar comprises the following chemical components in percentage by mass: c: 0.20 to 0.25%, Si: 0.50-0.80%, Mn: 1.25-1.55%, P is less than or equal to 0.045%, S is less than or equal to 0.045%, and Cr: 0.15-0.25%, V: 0.010-0.025 percent, Ceq less than or equal to 0.54 percent, and the balance of Fe and inevitable impurities. The preparation method sequentially comprises molten iron smelting, top-bottom combined blown converter blowing, constant oxygen pressure lance position changing operation and the like, so that the technological requirements of decarburization, dephosphorization and chromium protection are met, the chromium content of the molten steel after tapping reaches 0.15wt% -0.26 wt% by adjusting and controlling the oxygen supply amount of a top lance, the oxygen blowing position of the top lance, the blowing temperature and other technological parameters, the consumption of dephosphorization and decarburization alloys of the converter is reduced, the yield of chromium is stabilized, the optimal Indonesia powder ratio is determined, the smooth blowing of the converter is realized, the residual chromium in the molten iron is used for replacing manganese and vanadium elements, and the production cost of the deformed steel bar alloy is greatly reduced.
Description
Technical Field
The invention relates to deformed steel bar and a preparation method thereof, in particular to deformed steel bar produced by high-chromium molten iron and a preparation method thereof.
Background
The deformed steel bar is a steel product with large yield in China, and due to the implementation of GB1499.2-2018, the hot-rolled deformed steel bar basically adopts the micro-alloying technology to ensure the performance. The market competition of the deformed steel bar is strong, and the high quality and the low cost become the most competitive process requirement in the production of the deformed steel bar. In order to reduce the cost of molten iron, the blast furnace can adopt low-price Indonesia powder to partially replace iron ore for smelting. However, the Indonesia powder contains 2-4 wt% of chromium, so that the converter adopts the high-chromium molten iron smelting process, and the defects of difficult early-stage slagging, splashing in the middle and later stages, serious loss of iron and steel materials and the like easily occur, and therefore, the chromium content of the relatively suitable molten iron needs to be controlled, and a suitable converting process is developed to ensure the high-efficiency production of the converter.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide deformed steel bar which utilizes residual chromium element in molten iron to replace other alloy elements; a second object of the invention is to provide a method for producing low cost thread steel using high chromium molten iron.
According to the technical scheme, the deformed steel produced by high-chromium molten iron comprises the following chemical components in percentage by mass: c: 0.20 to 0.25%, Si: 0.50-0.80%, Mn: 1.25-1.55%, P is less than or equal to 0.045%, S is less than or equal to 0.045%, and Cr: 0.15-0.25%, V: 0.010-0.025 percent, Ceq less than or equal to 0.54 percent, and the balance of Fe and inevitable impurities.
The invention further protects a preparation method of the deformed steel bar produced by the high-chromium molten iron, which comprises the following steps:
firstly, preparing high-chromium molten iron in a blast furnace by partially replacing iron ore with Indonesia powder, and controlling the chromium content of the molten iron to be 0.20-0.35 wt%;
step two, adding the high-chromium iron and the waste steel prepared in the step one into a top-bottom combined blowing converter, blowing oxygen by a top gun, blowing nitrogen by a bottom gun, adopting constant-oxygen-pressure lance position changing operation in the blowing process, controlling the bottom blowing flow to be unchanged, and smelting;
thirdly, respectively adding lime, ore and magnesium balls within 5min from blow-on to blowing, controlling the top lance position to be 1700-1950 mm, and carrying out high lance position blowing;
step four, reducing the lance position of the top lance to 1600-1800 mm within 5-10min after blowing, continuously adding the rest lime and the ore for blowing,
and step five, gradually reducing the gun position according to the activity of the slag after blowing is started for 10min to the end of blowing, continuously pulling carbon, and finally pouring slag, measuring the temperature, sampling and tapping.
In the technical scheme, the blowing operation of decarburization, dephosphorization and chromium protection is required to be considered for the blowing of the chromium-containing molten iron. In the early stage of converting, blow to within 5min, adopt high gun position operation after the oxygen rifle is igniteed, improve the gun position about 300mm when than ordinary molten iron converting, the oxygen supply volume of controlling the top lance simultaneously is 20000~22000 Nm3H, preferably 22000Nm3Determining the addition amount of lime according to the silicon and phosphorus contents of molten iron, and basically controlling the addition amount of the lime of the first batch material to be about two thirds of the total amount, so that the slag fluidity in the early stage is improved; lime and the like are added to generate early-stage high-alkalinity slag to realize dephosphorization and decarburization, high lance position large oxygen supply and addition of ore are favorable for accelerating dephosphorization and decarburization reactions, and early-stage slag drying is avoided; simultaneously controlling the converting temperature to be 1400-1500 ℃, and realizing the simultaneous oxidation of carbon and chromium under the low-temperature condition; controlling the blowing temperature to 1550-3The oxygen lance position is further reduced by 100-150 mm along with the rise of the temperature, the residual lime is added, the ore is added according to the condition of the slag and the temperature condition, the chromium oxide in the slag can be gradually reduced, the oxygen is blown into the molten pool at the lower lance position, the temperature can be increased, the lance position is reduced, the splashing can be avoided, the stirring of the molten pool is increased, and the reduction reaction is enhanced; in the period from 10min after blowing to the end of blowing, proper temperature and slag activity are controlled to ensure dephosphorization and decarbonization effects and smooth blowingAnd then, C in the molten steel reduces chromium (oxide of the generated chromium) entering the slag, and the recovery rate of chromium element is ensured, so that the chromium content of the molten steel is improved, the end point temperature is less than or equal to 1650 ℃, and the chromium content of the tapped molten steel reaches 0.15-0.26 wt%.
Further, in the first step, the content of the Indonesia powder is 9-11 wt%; wherein the Indonesia powder comprises the following chemical components in percentage by mass: TFe: 48 to 52% of SiO2：2～3％、Cr：2～3％、Al2O3: 7-9%, S is less than or equal to 0.3%, and P is less than or equal to 0.05%. Taking iron ore, Indonesian powder, coke, limestone or dolomite according to a proportion, loading the iron ore, Indonesian powder, coke, limestone or dolomite into the furnace from the top of the blast furnace in batches through a charging system, and blowing high-temperature hot air from a tuyere at the lower part of the blast furnace to react with the coke to generate high-temperature reducing gas; the furnace burden is heated, reduced, melted and slagged in the descending process and generates a series of physical and chemical changes, so that high-chromium molten iron is obtained, when iron making and proportioning are carried out, the content of Indonesia powder in percentage by mass is controlled to be 9-11 wt%, the content of chromium in the molten iron is 0.20-0.35%, and the residual chromium in the molten iron can not be fully utilized due to the low content of chromium; the too high proportion of the Indonesia powder and the too high chromium content affect the smooth operation of the converter smelting and are not beneficial to the high-efficiency blowing of the converter.
Further, in the first step, the high chromium molten iron comprises the following chemical components in percentage by mass: c: 4.0-5.2%, Si: 0.16-0.90%, Mn: 0.14-0.60%, P: less than or equal to 0.14 percent, S: less than or equal to 0.045%, Cr: 0.20-0.35%, and the balance of Fe and inevitable impurities.
Further, the adding amount of the high-chromium molten iron accounts for 80-85 wt% of the total mass of the high-chromium molten iron and the waste steel.
Further, in the third step, the addition amount of the lime accounts for two thirds of the total amount of the lime, wherein the mass ratio of the added lime, the added ore and the added magnesium balls is (21-22): (6-7): (2-3); in the fourth step, the mass ratio of the added lime to the added ore is (0.9-1.1): 1.
further, the flow rate of bottom-blown nitrogen of the bottom gun is 0.03-0.05 Nm3·h·t-1。
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: (1) according to the method, the chromium content of the molten steel after tapping reaches 0.15-0.26 wt% by adjusting and controlling the oxygen supply amount of the top lance, the oxygen blowing position of the top lance, the blowing temperature and other process parameters according to the oxidizing difference between chromium element and carbon and phosphorus, so that the consumption of converter dephosphorization and decarburization alloy is reduced, and the yield of chromium is stabilized; (2) according to the invention, under the condition of reducing the cost of molten iron, the optimal Indonesia powder proportion is determined, the smooth converter blowing is realized, the molten iron condition suitable for the high-efficiency converter blowing can be obtained by the proportion, the manganese and vanadium elements are replaced by the residual chromium in the molten iron, the manganese content is reduced by 0.10%, the vanadium is reduced by 0.005%, and the production cost of the deformed steel bar alloy is greatly reduced.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The embodiment provides deformed steel bar produced by high-chromium molten iron, which comprises the following chemical components in percentage by mass: c: 0.20%, Si: 0.50%, Mn: 1.25%, P: 0.001%, S: 0.0015%, Cr: 0.15%, V: 0.010 percent, Ceq less than or equal to 0.54 percent, and the balance of Fe and inevitable impurities. The preparation method comprises the following process steps:
firstly, taking iron ore, Indonesian powder, coke and dolomite according to a proportion, loading the iron ore, Indonesian powder, coke and dolomite into a furnace from the top of a blast furnace in batches through a charging system, and blowing high-temperature hot air from a tuyere at the lower part of the blast furnace to react with the coke to generate high-temperature reducing gas; the furnace burden is heated, reduced, melted and slagged in the descending process and generates a series of physical and chemical changes, thereby obtaining the high-chromium molten iron. The content of the added Indonesia powder in percentage by mass is 9 wt%, and the Indonesia powder comprises the following components: TFe: 48% SiO2：2％、Cr：2％、Al2O3: 7%, S: 0.3%, P: 0.03 percent; the conditions of the produced molten iron are as follows: c: 4.49%, Si: 0.38%, Mn: 0.17%, P: 0.11%, S: 0.01%, Cr: 0.21 percent.
Step two, 94 tons of molten iron and 23 tons of scrap steel are added into a 120 ton top-bottom combined blowing converter, oxygen is blown by a top lance, and constant oxygen pressure is adopted in the whole processChanging the gun position; the bottom gun blows nitrogen, and the bottom blowing flow in the blowing process is unchanged. From blow-on to blow-off within 5min, the top lance adopts 22000Nm3Oxygen supply blowing/h, bottom-blown nitrogen flow 0.04Nm3·h·t-1The blowing gun position is 20000mm, the temperature is slowly reduced to 1800mm from the blowing gun position after 1min, and the temperature in the blowing period is controlled to 1450 ℃; adding 2148kg of lime, 650kg of ore and 281kg of magnesium balls into the converter after blowing;
step three, when converting is carried out for 5-10min, the gun position of the top gun is reduced to 1650mm, and the oxygen supply amount is controlled to 22000Nm3Controlling the blowing temperature to 1600 ℃, and then adding the rest lime to obtain 827kg in total and 847kg in total;
and step four, gradually reducing the gun position according to the activity of the slag after blowing for 10min to the end of converting, continuously pulling carbon to ensure the recovery rate of chromium elements, finally deslagging, measuring the temperature, sampling and tapping, wherein the end point temperature is less than or equal to 1650 ℃, and the chromium content of the tapping molten steel reaches 0.16%.
Example 2
The embodiment provides deformed steel bar produced by high-chromium molten iron, which comprises the following chemical components in percentage by mass: c: 0.25%, Si: 0.80%, Mn: 1.55%, P: 0.002%, S: 0.015%, Cr: 25%, V: 0.025 percent, Ceq less than or equal to 0.54 percent, and the balance of Fe and inevitable impurities. The preparation method comprises the following process steps:
taking iron ore, Indonesian powder, coke and limestone according to a proportion, loading the iron ore, Indonesian powder, coke and limestone into a furnace from the top of a blast furnace in batches through a charging system, and blowing high-temperature hot air from a tuyere at the lower part of the blast furnace to react with the coke to generate high-temperature reducing gas; the furnace burden is heated, reduced, melted and slagged in the descending process and generates a series of physical and chemical changes, thereby obtaining the high-chromium molten iron. The content of the added Indonesia powder in percentage by mass is 10 wt%, and the Indonesia powder comprises the following components: TFe: 52% SiO2：6％、Cr：6％、Al2O3: 9%, S: 0.2%, P: 0.0 percent; the conditions of the produced molten iron are as follows: c: 4.53%, Si: 0.41%, Mn: 0.18%, P: 0.18%, S: 0.01%, Cr: 0.35 percent.
Step two, adding 98 tons of the mixture into a 120-ton top-bottom combined blowing converterMolten iron, 22 tons of scrap steel, oxygen blowing by a top lance, and constant oxygen pressure lance position changing operation in the whole process; the bottom gun blows nitrogen, and the bottom blowing flow in the blowing process is unchanged. Within 5min from blow-on to converting, 21000Nm is adopted as a top lance3Oxygen supply blowing/h, bottom-blown nitrogen flow 0.04Nm3·h·t-1The blowing gun position is 20000mm, the temperature is slowly reduced to 1850mm from the blowing gun position after 1min, and the temperature in the blowing period is controlled to be 1480 ℃; 2368kg of lime, 800kg of ore and 323kg of magnesium balls are added into the converter after blowing;
step three, when converting is carried out for 5-10min, the gun position of the top gun is reduced to 1700mm, and the oxygen supply amount is controlled to be 21000Nm3Controlling the blowing temperature to be 1630 ℃, and then adding 1032kg of the rest lime and 932kg of the ore;
and step four, gradually reducing the gun position according to the activity of the slag after blowing for 10min to the end of blowing, continuously pulling carbon to ensure the recovery rate of chromium elements, finally deslagging, measuring the temperature, sampling and tapping, wherein the end point temperature is less than or equal to 1650 ℃, and the chromium content of the tapping molten steel reaches 0.26%.
Example 3
The embodiment provides deformed steel bar produced by high-chromium molten iron, which comprises the following chemical components in percentage by mass: c: 0.22%, Si: 0.65%, Mn: 1.40%, P: 0.002%, S: 0.0025%, Cr: 0.20%, V: 0.018 percent of Ceq, less than or equal to 0.54 percent of Ceq, and the balance of Fe and inevitable impurities. The preparation method comprises the following process steps:
firstly, taking iron ore, Indonesian powder, coke and dolomite according to a proportion, loading the iron ore, Indonesian powder, coke and dolomite into a furnace from the top of a blast furnace in batches through a charging system, and blowing high-temperature hot air from a tuyere at the lower part of the blast furnace to react with the coke to generate high-temperature reducing gas; the furnace burden is heated, reduced, melted and slagged in the descending process and generates a series of physical and chemical changes, thereby obtaining the high-chromium molten iron. The mass percentage content of the added Indonesia powder is 11wt%, and the Indonesia powder comprises the following components: TFe: 50% SiO2：2％、Cr：3％、Al2O3: 8%, S: 0.2%, P: 0.05 percent; the conditions of the produced molten iron are as follows: c: 5.1%, Si: 0.72%, Mn: 0.42%, P: 0.10%, S: 0.02%, Cr: 0.28 percent.
Step two, adding 96 tons of molten iron and 24 tons of scrap steel into a 120 ton top-bottom combined blowing converter, blowing oxygen by a top lance, and adopting constant oxygen pressure lance position changing operation in the whole process; the bottom gun blows nitrogen, and the bottom blowing flow in the blowing process is unchanged. From blow-on to blow-off within 5min, the top lance adopts 22000Nm3Oxygen supply blowing/h, bottom-blown nitrogen flow 0.04Nm3·h·t-1The blowing gun position is 20000mm, the temperature is slowly reduced to 1900mm from the blowing gun position after 1min, and the temperature in the blowing period is controlled to be 1500 ℃; adding 2108kg of lime, 680kg of ore and 253kg of magnesium balls into the converter after blowing;
step three, when converting for 5-10min, reducing the gun position of the top gun to 1750mm, and controlling the oxygen supply amount to 22000Nm3Controlling the blowing temperature to be 1700 ℃, and then adding 965kg of the rest lime in total and 947kg of ore in total;
and step four, gradually reducing the gun position according to the activity of the slag after blowing for 10min to the end of converting, continuously pulling carbon to ensure the recovery rate of chromium elements, finally deslagging, measuring the temperature, sampling and tapping, wherein the end point temperature is less than or equal to 1650 ℃, and the chromium content of the tapping molten steel reaches 0.19 percent.
Comparative example 1
The preparation process is the same as example 1, except that the ordinary converting process is adopted in the second step, namely 20000Nm is adopted for the top lance3Oxygen supply blowing/h, bottom-blown nitrogen flow 0.03Nm3·h·t-1The blowing position of the top lance is always kept at 1400-1600mm, and the blowing temperature is controlled at 1500-1600 ℃. And after blowing is finished, deslagging, measuring the temperature, sampling and tapping, wherein the final temperature is less than or equal to 1650 ℃, and the chromium content of the tapped molten steel is 0.12%.
Comparative example 2
The preparation process is the same as that of example 1, except that the high-chromium molten iron prepared without the Indonesia powder is prepared by adopting common molten iron under the following conditions: c: 4.69%, Si: 0.48%, Mn: 0.22%, P: 0.12%, S: 0.04%, Cr: 0.10 percent. And after blowing is finished, deslagging, measuring the temperature, sampling and tapping, wherein the final temperature is less than or equal to 1650 ℃, and the chromium content of the tapped molten steel is 0.06%.
TABLE 1 mechanical property tester for deformed steel bar
As can be seen from table 1, the deformed steel bars prepared in examples 1 to 3 all meet the national standard requirements for yield strength, tensile strength, maximum force elongation and other properties, and the preparation process can ensure that the deformed steel bars prepared by the preparation process have excellent mechanical properties and greatly save the consumption of alloy elements when the chromium content in the tapping molten steel reaches 0.15wt% -0.26 wt%; the processes of comparative examples 1 and 2 make the chromium content of the final tapping molten steel low, and a large amount of alloy elements still need to be consumed in the subsequent process of preparing the deformed steel bar, so that the low-cost preparation cannot be realized.
Claims (9)
1. A deformed steel bar produced by high-chromium molten iron is characterized in that: the chemical components comprise the following components in percentage by mass: c: 0.20 to 0.25%, Si: 0.50-0.80%, Mn: 1.25-1.55%, P is less than or equal to 0.045%, S is less than or equal to 0.045%, and Cr: 0.15-0.25%, V: 0.010-0.025 percent, Ceq less than or equal to 0.54 percent, and the balance of Fe and inevitable impurities.
2. A method for producing a deformed steel bar according to claim 1, comprising the steps of:
firstly, preparing high-chromium molten iron in a blast furnace by partially replacing iron ore with Indonesia powder, and controlling the chromium content of the molten iron to be 0.20-0.35 wt%;
step two, adding the high-chromium iron and the waste steel prepared in the step one into a top-bottom combined blowing converter, blowing oxygen by a top gun, blowing nitrogen by a bottom gun, adopting constant-oxygen-pressure lance position changing operation in the blowing process, controlling the bottom blowing flow to be unchanged, and smelting;
thirdly, respectively adding lime, ore and magnesium balls within 5min from blow-on to blowing, controlling the top lance position to be 1700-1950 mm, and carrying out high lance position blowing;
step four, reducing the lance position of the top lance to 1600-1800 mm within 5-10min after blowing, continuously adding the rest lime and the ore for blowing,
and step five, gradually reducing the gun position according to the activity of the slag after blowing is started for 10min to the end of blowing, continuously pulling carbon, and finally pouring slag, measuring the temperature, sampling and tapping.
3. The method for producing a deformed steel bar according to claim 2, wherein: in the third step, the blowing temperature is controlled to be 1400-1500 ℃; in the fourth step, the converting temperature is controlled to be 1550-1700 ℃; in the fifth step, the blowing end temperature is controlled to be less than or equal to 1650 ℃.
4. The method for producing a deformed steel bar according to claim 2, wherein: the oxygen supply amount of the top lance is 20000-22000 Nm3/h。
5. The method for producing a deformed steel bar according to claim 2, wherein: in the first step, the mass percentage content of the Indonesia powder is 9-11 wt%; wherein the Indonesia powder comprises the following chemical components in percentage by mass: TFe: 48 to 52% of SiO2：2～3%、Cr：2～3%、Al2O3：7～9%，S≤0.3%、P≤0.05%。
6. The method for producing a deformed steel bar according to claim 2, wherein: in the first step, the high chromium molten iron comprises the following chemical components in percentage by mass: c: 4.0-5.2%, Si: 0.16-0.90%, Mn: 0.14-0.60%, P: less than or equal to 0.14 percent, S: less than or equal to 0.045%, Cr: 0.20 to 0.35%, and the balance of Fe and inevitable impurities.
7. The method for producing a deformed steel bar according to claim 2, wherein: in the second step, the adding amount of the high-chromium molten iron accounts for 80-85 wt% of the total mass of the high-chromium molten iron and the waste steel.
8. The method for producing a deformed steel bar according to claim 2, wherein: in the third step, the addition amount of the lime accounts for two thirds of the total amount of the lime, wherein the mass ratio of the added lime, the added ore and the added magnesium balls is (21-22): (6-7): (2-3); in the fourth step, the mass ratio of the added lime to the added ore is (0.9-1.1): 1.
9. the method for producing a deformed steel bar according to claim 2, wherein: the bottom blowing nitrogen flow rate of the bottom gun is 0.03-0.05 Nm3·h·t-1。
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| CN114774621A (en) * | 2022-03-31 | 2022-07-22 | 宝武集团鄂城钢铁有限公司 | Extremely-low-cost converter smelting production method for deformed steel bar |
| CN114875206A (en) * | 2022-04-11 | 2022-08-09 | 辽宁石源科技有限公司 | Phosphorus removal and chromium protection double process for smelting chromium-containing high-phosphorus metal liquid from laterite-nickel ore |
| CN115466824A (en) * | 2022-09-16 | 2022-12-13 | 山西太钢不锈钢股份有限公司 | Processing method for AOD (automatic optic inspection) on-off ignition failure |
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